12,518 of Washington County, UT citizens are speakers of a non-English language, which is lower than the national average of 21.1%. In 2015, the most common non-English language spoken in Washington County, UT was Spanish. 6.25% of the overall population of Washington County, UT are native Spanish speakers. 0.27% speak Other Pacific Island and 0.25% speak German, the next two most common languages.

When compared to other counties, Washington County, UT has a relatively high number of residents that are native Navajo speakers. In 2015, there were 177 native Navajo speakers living in Washington County, UT, approximately 2.38 times more than would be expected based on the language's frequency in the US more broadly.